package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;


//@Order(1)  //过滤器的顺序
@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> params = request.getQueryParams();

        //2.获取请求参数中的authorization参数
        String auth = params.getFirst("authorization");
        //3.判断参数值是否为admin
        if ("admin".equals(auth)) {
            //4.判断是否同时满足，满足就放行
            return chain.filter(exchange);
        }

        //5.否，拦截
        //5.1禁止访问，设置状态码
        exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
        //5.2结束处理
        return exchange.getResponse().setComplete();

    }
    @Override
    public int getOrder() {
        return 1;
    }
}
